Method, device, and computer program product for determining a sensitivity of at least one eye of a test subject

Abstract

A method for determining the sensitivity of at least one eye of a test subject based on at least two provided pairs of values for visual acuity and refraction, wherein at least one of the pairs of values for visual acuity and refraction. The method includes: projecting a target with an adjustable target refraction into the at least one eye of the test subject, wherein the target is configured to verify a predetermined visual acuity; and determining a visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined visual acuity by varying the target refraction of the target projected into the at least one eye of the test subject and detecting a test subject action which results in a determination that the identifiability of the target for the test subject has changed at the time of the test subject action.

1 . A method for determining a sensitivity of at least one eye of a test subject based on at least two provided pairs of values for visual acuity and refraction, wherein at least one of the pairs of values for visual acuity and refraction is provided by:
 projecting a target with an adjustable target refraction into the at least one eye of the test subject, wherein the target is configured to verify a predetermined visual acuity; and   determining a visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined visual acuity by varying the target refraction of the target projected into the at least one eye of the test subject and detecting a test subject action which results in a determination that an identifiability of the target for the test subject has changed at a time of the test subject action,   wherein the sensitivity is determined based on at least one calculated false refraction, wherein the at least one calculated false refraction is calculated based on the determined optimum refraction.   
     
     
         2 . The method according to  claim 1 ,
 wherein prior to the step of projecting a target, which is configured to verify a predetermined visual acuity, into the at least one eye of the test subject, an objective and/or subjective refraction result of the at least one eye of the test subject is determined, and   wherein, preferably prior to the step of varying the target refraction, the target is projected into the at least one eye of the test subject with such a starting target refraction that the test subject can only recognize the target out of focus and/or cannot identify it.   
     
     
         3 . The method according to  claim 1 , further comprising the step of
 determining an optimum refraction of the at least one eye of the test subject and determining the visual acuity achieved by the at least one eye of the test subject when compensating for a possible ametropia of the at least one eye of the test subject based on the determined optimum refraction.   
     
     
         4 . The method according to  claim 1 , further comprising the steps of:
 determining a subjective refraction result for at least one eye of the test subject; and   determining the visual acuity achieved by the at least one eye of the test subject when compensating for a possible ametropia of the at least one eye of the test subject based on the determined subjective refraction result,   wherein the optimal refraction of the at least one eye of the test subject is determined based on the subjective refraction result and an objective refraction result.   
     
     
         5 . (canceled) 
     
     
         6 . The method according to  claim 1 , wherein varying the target refraction comprises monotonically decreasing the target refraction and/or monotonically increasing the target refraction. 
     
     
         7 . The method according to  claim 1 , wherein the determination of a visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined visual acuity is carried out by decreasing the target refraction and detecting a test subject action while decreasing of the target refraction, and/or by increasing the target refraction and detecting a test subject action while increasing of the target refraction, wherein each test subject action results in a determination that the identifiability of the target for the test subject has changed at the time of the respective test subject action. 
     
     
         8 . The method according to  claim 1 , wherein at least two of the provided pairs of values for visual acuity and refraction are provided by:
 projecting a first target with a first adjustable target refraction into the at least one eye of the test subject, wherein the first target is configured to verify a predetermined first visual acuity;   determining a first visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined first visual acuity by varying the first target refraction of the first target projected into the at least one eye of the test subject and detecting a first test subject action which results in a determination that the identifiability of the first target for the test subject has changed at the time of the first test subject action;   projecting a second target with a second adjustable target refraction into the at least one eye of the test subject, wherein the second target is configured to verify a predetermined second visual acuity which differs from the predetermined first visual acuity; and   determining a second visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined second visual acuity by varying the second target refraction of the second target projected into the at least one eye of the test subject and detecting a second test subject action which results in a determination that the identifiability of the second target for the test subject has changed at the time of the second test subject action.   
     
     
         9 . The method according to  claim 1 , wherein determining a visual acuity limiting refraction comprises measuring an accommodation state and/or a pupil size of the at least one eye of the test subject, wherein measuring the accommodation state and/or the pupil size is performed in particular at the time of or immediately after the test subject action. 
     
     
         10 . The method according to  claim 1 , wherein the test subject is presented with a visual task with at least two possible different answers in order to determine a visual acuity limiting refraction, and wherein the test subject can answer the visual task using the test subject action. 
     
     
         11 . The method according to  claim 1 ,
 wherein, prior to the step of determining a visual acuity limiting refraction, first aberrometric data of the at least one eye of the test subject, in particular for a distance accommodation state of the at least one eye of the test subject, are acquired, and   wherein preferably the method further comprises acquiring second aberrometric data of the at least one eye of the test subject for a near accommodation state of the at least one eye of the test subject, wherein the acquiring of second aberrometric data preferably occurs prior to the step of determining a visual acuity limiting refraction.   
     
     
         12 . A method for calculating, optimizing or evaluating a spectacle lens for at least one eye of a test subject taking into account the sensitivity of the at least one eye of the test subject, wherein the sensitivity of the at least one eye of the test subject is determined by a method according to  claim 1 . 
     
     
         13 . A method of manufacturing a spectacle lens, comprising:
 calculating or optimizing a spectacle lens according to the method of calculating or optimizing a spectacle lens according to claim  12 ; and   manufacturing the spectacle lens calculated or optimized in this way.   
     
     
         14 . A non-transitory computer program product, comprising program code which is adapted and configured, when loaded and executed on a computer, to perform a method according to  claim 1 . 
     
     
         15 . A device for determining a sensitivity of at least one eye of a test subject, comprising:
 a target providing device configured to provide a target which is configured to verify a predetermined visual acuity;   an optical system configured to project the target with a target refraction into the at least one eye of the test subject, wherein the optical system is configured to adjust and vary the target refraction;   a feedback unit configured to detect a test subject action in order to determine that an identifiability of the target for the test subject has changed at a time of the test subject action, in particular as a result of varying the target refraction of the target projected into the at least one eye of the test subject with aid of the optical system; and   a visual acuity limiting refraction determination unit configured to detect a visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined visual acuity, wherein the visual acuity limiting refraction determination unit is configured to detect the target refraction caused by the optical system at the time of the test subject action, and   an evaluation unit configured to determine the sensitivity based on at least one calculated false refraction that is calculated based on a determined optimum refraction of the at least one eye of the test subject.   
     
     
         16 . The device according to  claim 15 , wherein the evaluation unit is configured to determine the sensitivity of the at least one eye of the test subject based on at least two provided pairs of values for visual acuity and refraction, and wherein the visual acuity limiting refraction determination unit is a component of the evaluation unit. 
     
     
         17 . The device according to  claim 15 , further comprising:
 an auto-refractometric or aberrometric measuring unit configured to determine one or more objective refractions of the at least one eye of the test subject, wherein the auto-refractometric or aberrometric measuring unit is configured to measure and/or monitor an accommodation state of the at least one eye of the test subject.   
     
     
         18 . The device according to  claim 15 , further comprising:
 a pupil size measuring unit configured to determine a pupil size of the at least one eye of the test subject; and/or   a lighting device configured to generate at least two brightness levels, and/or   a pupillometer device which is configured to detect first pupillometric data of the at least one eye at a first brightness and to detect secondary pupillometric data of the at least one eye at a second brightness.   
     
     
         19 . A system for calculating, optimizing or evaluating a spectacle lens for at least one eye of a test subject taking into account the sensitivity of the at least one eye of the test subject, comprising a device for determining the sensitivity of the at least one eye of a spectacle wearer according to  claim 15 . 
     
     
         20 . A device for manufacturing a spectacle lens, comprising:
 a calculator or optimizer which are configured to calculate or optimize the spectacle lens according to a method for calculating or optimizing a spectacle lens according to  claim 12 ; and   processors which are configured to process the spectacle lens according to the result of the calculation or optimization.   
     
     
         21 . A spectacle lens, which has been produced using a method according to  claim 13 .